dekametre vs British spelling

dekametre and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
dekametre	Yes	No	No	No
British spelling	Yes	No	No	No

dekametre (noun)	British spelling (noun)
a metric unit of length equal to ten meters	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')